Bihar PGT Chemistry Mock Test - 9 - Bihar PGT/TGT/PRT MCQ

Rule- If the reporting verb is in the past tense, the verb in the reported speech is changed to the corresponding past form.  
Thus, the sentence is changed to the corresponding past form. 

A realist is a person who analyses every problem on real and factual terms.
Example- The world today requires realist leaders more than anything else.

चाँदनी के पर्यायवाची शब्द है - चन्द्रिका, कौमुदी, ज्योत्स्ना, चन्द्रमरीचि, उजियारी, चन्द्रप्रभा, जुन्हाई आदि।

मयंक, चांद का पर्यायवाची है।

"पर + अधीन" शुद्ध सन्धि विच्छेद है। जिसके मेल होने पर पराधीन शब्द बनेगा।

इसमें 'अ + आ = आ' का सूत्र प्रयोग हुआ है। इसमें दीर्घ सन्धि है।

देश शब्द पुल्लिंग है। पर्वतो तथा दिनो के नाम पुल्लिंग होते हैं इसलिए सोमवार और हिमालय भी पुल्लिंग होगा।

विकल्पो में दिए गए रचनाकार - रचना के सभी युग्म सही सुमेलित हैं।

The logic followed is:

Abduct and Kidnap are synonyms.

Similarly,

Fierce and Violent are synonyms.

Hence, the correct answer is "Violent".

The logic followed is:

ROSE is coded as 6821

CHAIR is coded as 73456

PREACH is coded as 961473

Therefore SEARCH will be written as

Hence, the correct answer is "214673".

The correct answer is Accra.

• Accra is the capital and the most populous city of Ghana, with an estimated urban population of 2.27 million as of 2012.
• Ghana is a country located in West Africa.
• Ghanaian cedi is the currency of Ghana.
• Ghana or the Republic of Ghana is located along the Gulf of Guinea and the Atlantic Ocean.

A preamble is an introductory statement in a document that explains the document’s philosophy and objectives.

• In a Constitution, it presents the intention of its framers, the history behind its creation, and the core values and principles of the nation.
• The preamble basically gives an idea of the following things/objects:
  • Source of the Constitution
  • Nature of Indian State
  • Statement of its objectives
  • Date of its adoption

Important Points

Keywords in the Preamble:

• We, the people of India: It indicates the ultimate sovereignty of the people of India. Sovereignty means the independent authority of the State, not being subject to the control of any other State or external power.
• Sovereign: The term means that India has its own independent authority and it is not a dominion of any other external power. In the country, the legislature has the power to make laws that are subject to certain limitations.
• Socialist: The term means the achievement of socialist ends through democratic means. It holds faith in a mixed economy where both private and public sectors co-exist side by side.
  • It was added in the Preamble by 42nd Amendment, 1976.
• Secular: The term means that all the religions in India get equal respect, protection and support from the state.
  • It was incorporated in the Preamble by the 42nd Constitutional Amendment, 1976.
• Democratic: The term implies that the Constitution of India has an established form of Constitution that gets its authority from the will of the people expressed in an election.
• Republic: The term indicates that the head of the state is elected by the people. In India, the President of India is the elected head of the state.

From the above, it is clear that the term ‘We’ in Preamble means the People of India.

The pattern followed is:

Hence, the correct answer is "110".

Five persons A,B,C,D and E are sitting one above the other on a ladder (not necessarily in the same order).

1) B is sitting above A with one person between them.

2) Only two persons are sitting between A and C. If C is not sitting top, the figure are given below -

In which there is two case in which first one is -

Second case are given below -

After observation of both cases, B is the sitting in the middle.

Hence, "B" is the correct answer.

Preparing the family tree using the following symbols:

A possible tree diagram will be:

Praveena’s father’s sister’s mother is the grandmother of Sandhya.

Hence, "Grandmother" is the correct answer.

The correct answer is 1950-51.

Key Points

• Economic Survey is a report of the government on the state of the economy of the country during the last one year.
• It is prepared by the Department of Economic Affairs, under the Ministry of Finance.
• Chief Economic Advisor releases the Economic Survey.
• At first, it was released along with the Union Budget but later it was separated from the budget in 1964 to give a better understanding of the budget proposals.
• It is released one day before the Union Budget.
• Now it is presented in 2 volumes.
• It has no constitutional backing. Its findings and suggestions are not binding on the government.
• First Chief Economic Advisor to the government was Mr. J.J. Anjaria.
• The current Chief Economic Advisor is Dr. V. Anantha Nageswaran.

The correct answer is Virtual and erect.

Key Points

• A plane mirror is a mirror with a flat reflective surface.
  • For light rays striking a plane mirror, the angle of reflection equals the angle of incidence.
  • The angle of the incidence is the angle between the incident ray and the surface normal.
  • The image formed by a plane mirror is always virtual and erect.​
  • The image formed by the plane mirror is virtual and erect i.e. image cannot be projected or focused on a screen.
  • The distance of the image 'behind' the mirror is the same as the distance of the object in front of the mirror.
  • The size of the image formed is the same as the size of the object.

Additional Information

• A convex mirror or diverging mirror is a curved mirror in which the reflective surface bulges towards the light source.
  • Convex mirrors reflect light outwards, therefore they are not used to focus light.
  • The image is smaller than the object but gets larger as the object approaches the mirror.
• A concave mirror is called a converging mirror because it converges the Ray of light incident parallels to the mirror into a point called the focus.

The correct answer is Western disturbances.

Key Points

The western cyclonic disturbances are weather phenomena of the winter months brought in by the westerly flow from the Mediterranean region.

• They usually influence the weather of the north and north-western regions of India.
• Tropical cyclones occur during the monsoon, as well as, in October-November, and are part of the easterly flow.
• These disturbances affect the coastal regions of the country.
• Thus, we can conclude that Western disturbances cause rainfall during winters in the north-western part of India.

Important Points

• Retreating means withdrawal. So, the withdrawal of southwest monsoon winds from the skies of north India during the months of October and November is known as the retreating monsoon.
• The period of June to September is referred to as the 'Southwest Monsoon' period. The Southwest Monsoon period is the principal rainy season for the Indian subcontinent. This is the summer monsoon period where the southwest monsoon holds away over the country.

The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and nitrogen (NO2). Acid rain usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, and oxidants. this mixture forms a mild solution of sulfuric acid and nitric acid.

It is an α, β-unsaturated ketone which can be formed in an aldol condensation followed by dehydration.

Both (S – 1) & (S – 2) are true and (S – 2) is not the correct explanation of    (S – 1)

Crystallization: A chemical solid-liquid separation technique in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.

Additional Information:

• Crude sodium chloride, generally obtained by the crystallization of brine solution, contains sodium sulphate, calcium sulphate, calcium chloride and magnesium chloride as impurities.
• To get pure sodium chloride first the crude sodium chloride is dissolved in a minimum amount of water and filtered to remove insoluble impurities.
• Now into the saturated solution of sodium chloride hydrogen chloride gas is passed.
• Then pure sodium chloride crystallizes.
• The other compounds which are present in small amounts such as MgCl2MgCl2 and CaCl2CaCl2 remain in solution.

Diazonium reacts with phenols and napthols to form dyes.

The correct answer is Option B.

Rate =k[A]ⁿ[B]^m
          
When 
A'= 2A and
B'= 0.5B
 
The new rate becomes Rate' 
=[2A]ⁿ[0.5]^m

Photoelectric effect proves the particle nature of light.

It forms a secondary carbocation which, by hydride shift, rearranges to a tertiary carbocation.

Also X, has CH₃—CH(OH)—, gives iodoform test and it is chiral.